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Analog Devices Inc./Maxim Integrated MAX6318LHUK29BX-T
- Part No.:
- MAX6318LHUK29BX-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK29BX-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,778
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Product details
Overview
MAX6318LHUK29BX-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-high push/pull reset output, 2.93V factory-trimmed reset threshold, 140ms minimum reset timeout, and 6.3ms typical watchdog timeout. It monitors VCC supply integrity and provides manual reset capability, serving as a system-level power-on/brownout guard in embedded controllers and portable instrumentation.
For engineers reviewing the MAX6318LHUK29BX-T datasheet, MAX6318LHUK29BX-T pinout, MAX6318LHUK29BX-T application, or MAX6318LHUK29BX-T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), bidirectional reset compatibility (though not implemented in this variant), and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK29BX-T implements a precision voltage monitor using a laser-trimmed resistor divider to set its 2.93V reset threshold with ±1.5% tolerance at +25°C and ±2.5% over –40°C to +125°C. Its reset generator asserts RESET high for ≥140ms after VCC rises above VRST, with propagation delay <40µs during VCC fall.
It features a watchdog timer cleared by edges on WDI (50ns minimum pulse width), with factory-set 6.3ms timeout ('W' suffix). The active-high push/pull RESET output sources ≥500µA at VCC ≥ 2.7V and sinks ≥1.2mA at VCC ≥ 2.7V, ensuring robust drive into µP reset inputs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% at +25°C; ensures reliable power-up detection for 3.3V systems with margin against brownout. |
| Reset Timeout | 140ms minimum; guarantees µP remains held in reset long enough for stable clock and supply settling. |
| Watchdog Timeout | 6.3ms typical; enables fast fault recovery for time-critical embedded firmware loops. |
| Supply Current | 5µA typical at VCC = 3.6V; minimizes quiescent load in battery-powered applications. |
| Operating Temp | –40°C to +125°C; supports extended industrial and automotive under-hood environments. |
| VCC Range | 1.0V to 5.5V; allows valid reset assertion even during deep brownout conditions. |
| Reset Output Type | Active-high push/pull; eliminates need for external pullup and ensures defined logic level at all times. |
Pinout & Package
MAX6318LHUK29BX-T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push/pull reset output; drives µP reset input directly-no external pullup required. |
| 2 | GND | Ground reference for all internal comparators and output stages; must be low-impedance connection. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52kΩ; debounced by 100ns glitch rejection. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); disables watchdog if left unconnected or three-stated. |
| 5 | VCC | Supply input monitored for reset assertion; absolute max rating –0.3V to +6V; operates down to 1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| No external components | Integrated voltage reference, reset timer, watchdog, and push/pull driver eliminate BOM cost and layout area. |
| Guaranteed reset to 1V | Ensures deterministic reset behavior during severe brownout-critical for fail-safe embedded control. |
| Short transient immunity | Immune to VCC glitches <4µs duration and >100mV amplitude below VRST-reduces false resets in noisy environments. |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 1: –40°C to +125°C), enabling use in ADAS and body electronics. |
| Factory-trimmed accuracy | 2.93V threshold trimmed to ±1.5% at +25°C and ±2.5% over full temperature range-no calibration needed. |
Applications
| Portable/Battery-Powered Equipment | Embedded Control Systems |
|---|---|
|
Use Scenario: Power management in handheld test meters with Li-ion battery supply prone to voltage sag during peak current draw. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-high RESET to halt MCU execution until battery recovers above 2.93V, then holds reset for 140ms. Use Value: Prevents corrupted EEPROM writes and state machine lockup during intermittent low-voltage events. |
Use Scenario: Industrial PLC I/O module requiring deterministic boot sequence after AC power interruption. IC Role / Device Role / Timing Role: Generates clean, timed reset pulse synchronized to VCC recovery; watchdog guards against firmware hang during analog sensor polling. Use Value: Eliminates need for discrete RC reset networks and external watchdog IC, reducing component count by 3–5 parts. |
| Intelligent Instruments | Controllers |
|
Use Scenario: Digital multimeter with real-time signal processing ASIC that must initialize only after stable 3.3V rail. IC Role / Device Role / Timing Role: Active-high RESET output directly interfaces ASIC reset pin; MR allows front-panel hard reset without CPU involvement. Use Value: Ensures ASIC enters known configuration before clock enable-prevents metastability in ADC digital interface. |
Use Scenario: HVAC zone controller powered from 24VAC-derived 3.3V SMPS with variable load-induced ripple. IC Role / Device Role / Timing Role: Supervises 3.3V rail; uses 6.3ms watchdog to detect communication stack freeze in Modbus RTU firmware. Use Value: Recovers communication link autonomously within 10ms of fault-meets UL 60730 Class B self-test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK29BX-T | Bidirectional active-low RESET output instead of active-high push/pull; same 2.93V threshold, 140ms timeout, 6.3ms watchdog. | Required when interfacing with µPs having bidirectional reset pins (e.g., Motorola 68HC11) where external pullup conflicts with bus topology. | Select MAX6318MHUK29BX-T only if bidirectional reset signaling is mandatory; otherwise MAX6318LHUK29BX-T simplifies design with no external components. |
| TLV803EB29DBVR | Single-function reset IC (no watchdog or MR); 2.93V threshold; 200ms reset timeout; SOT23-5; lower supply current (0.5µA). | Suitable for cost-sensitive, non-safety-critical applications where watchdog and manual reset are unnecessary. | Choose TLV803EB29DBVR only when watchdog and MR features are omitted from system requirements-saves $0.12/unit but removes fault coverage. |
Compared with MAX6318MHUK29BX-T, the MAX6318LHUK29BX-T delivers simpler integration via active-high push/pull output, while TLV803EB29DBVR trades away watchdog/MR functionality for ultra-low quiescent current-making MAX6318LHUK29BX-T optimal for balanced feature set and reliability in industrial controllers.
Availability
MAX6318LHUK29BX-T is available at Aetrix Electronics and suitable for portable instrumentation, embedded control systems, and intelligent controllers requiring stable component supply with AEC-Q100 qualification and guaranteed -40°C to +125°C operation.
Supply support for MAX6318LHUK29BX-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, and computing applications, emphasizing high reliability and integrated functionality.
The MAX6316–MAX6322 family was engineered specifically for microprocessor supervision in space-constrained, high-reliability systems-delivering factory-trimmed voltage monitoring, configurable reset timing, and watchdog protection in miniature SOT23 packages.
FAQ
What is the reset output polarity and drive strength of MAX6318LHUK29BX-T?
The MAX6318LHUK29BX-T features an active-high push/pull reset output. At VCC ≥ 2.7V, it sources ≥500µA (VOH ≥ 0.8×VCC) and sinks ≥1.2mA (VOL ≤ 0.3V), enabling direct connection to µP reset inputs without external pull resistors. This drive strength ensures fast, noise-immune reset assertion across temperature and voltage ranges.
Does MAX6318LHUK29BX-T include a manual reset input and how is it implemented?
Yes, MAX6318LHUK29BX-T includes an active-low manual reset (MR) input (Pin 3). It is internally pulled up to VCC via a 52kΩ resistor and rejects glitches <100ns. Driving MR low forces reset for the full 140ms timeout period, making it suitable for front-panel reset buttons without external debounce circuitry.
What watchdog timeout period is configured in MAX6318LHUK29BX-T and how is it enabled?
MAX6318LHUK29BX-T has a factory-set 6.3ms typical watchdog timeout ('W' suffix). The watchdog is enabled by connecting WDI (Pin 4) to a µP GPIO that toggles edges within each timeout window. Leaving WDI unconnected or three-stating it disables the watchdog function entirely.
Is MAX6318LHUK29BX-T qualified for automotive applications?
MAX6318LHUK29BX-T is AEC-Q100 qualified (Grade 1: –40°C to +125°C), confirming its suitability for automotive body electronics and ADAS subsystems. While not marked with '/V' (automotive-specific screening), its qualification covers thermal, ESD, and reliability testing per AEC standards-enabling use in non-safety-critical vehicle domains.
How does MAX6318LHUK29BX-T behave during deep brownout conditions below 1.0V?
MAX6318LHUK29BX-T guarantees valid reset output down to VCC = 1.0V. Below 1.0V, the internal circuitry ceases operation and RESET becomes undefined. For applications requiring asserted reset down to 0V, a 100kΩ pullup resistor from RESET to VCC is recommended-this ensures logic-high state during final discharge phase.
MAX6318LHUK29BX-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK29BX-T FAQ
1.How can I place an order for MAX6318LHUK29BX-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK29BX-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6318LHUK29BX-T reliable?
The price and inventory of MAX6318LHUK29BX-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK29BX-T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK29BX-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK29BX-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK29BX-T?
MAX6318LHUK29BX-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK29BX-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6318LHUK29BX-T?
For technical support, including MAX6318LHUK29BX-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK29BX-T requirements.
6.How does Aetrix verify that MAX6318LHUK29BX-T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK29BX-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6318LHUK29BX-T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK29BX-T?
All MAX6318LHUK29BX-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK29BX-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6318LHUK29BX-T part is unused and in its original packaging.
Return procedure for MAX6318LHUK29BX-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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